<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!--角色列表区域-->
      <el-table :data="roleList" border stripe>
        <!--展开列-->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!--使用如下方式格式化查看-->
            <!-- <pre>{{scope.row}}</pre> -->
            <el-row
              :class="['vcenter', 'bdbottom', i1 === 0 ? 'bdtop' : 'bdbottom']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag
                  closable
                  @close="removeRightByID(scope.row, item1.id)"
                  >{{ item1.authName }}</el-tag
                >
                <i class="el-icon-caret-right e"></i>
              </el-col>
              <!--渲染二级和三级权限-->
              <el-col :span="19">
                <!--通过for循环嵌套渲染二级权限-->
                <el-row
                  :class="[
                    'vcenter',
                    'bdbottom',
                    i1 === 0 ? 'bdtop' : 'bdbottom',
                  ]"
                  v-for="item2 in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightByID(scope.row, item2.id)"
                      >{{ item2.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right e"></i>
                  </el-col>
                  <!-- for循环渲染三级权限-->
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightByID(scope.row, item3.id)"
                      >{{ item3.authName }}</el-tag
                    >
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!--索引列-->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini"
              >编辑</el-button
            >
            <el-button type="danger" icon="el-icon-delete" size="mini"
              >删除</el-button
            >
            <el-button
              type="warning"
              icon="el-icon-setting"
              size="mini"
              @click="showSetRightDialog(scope.row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!--分配权限对话框-->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!--属性控件-->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        :default-expand-all="true"
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <!--底部按钮-->
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
  
<script>
export default {
  name: 'Roles',
  data() {
    return {
      // 所有角色列表数据
      roleList: [],
      setRightDialogVisible: false, // 控制分配权限对话框的显示与隐藏
      rightsList: [], // 所有权限的数据
      treeProps: {
        // 树形组件的绑定对象
        label: 'authName', // 内容
        children: 'children', // 父子节点
      },
      // 默认选中的节点ID值数组((只需三级权限ID即可)
      defKeys: [],
      roleId: '', //当前即将分配角色的ID
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.roleList = res.data
    },
    // 根据id删除对应权限
    async removeRightByID(role, rightId) {
      // 弹框提示是否删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该文件, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((err) => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 发送请求删除权限
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      // 重新更新数据,不能重新发送请求，这样会导致展开列关闭
      // 使用重新赋值比较好
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限失败')
      }
      // 获取到的权限数据保存到data中
      this.rightsList = res.data
      // 递归获取三级节点的ID
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式获取角色下所有三级权限的id并保存
    getLeafKeys(node, arr) {
      // node节点不包含childran属性即为第三级别
      if (!node.children) {
        return arr.push(node.id)
      }
      // 递归获取
      node.children.forEach((item) => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限关闭对话框的事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys(),
      ]
      // 所有ID以,逗号进行拼接
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配角色成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    },
  },
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>